Mike,
Thanks this was great! my tires measure 23.25 in diameter when measured
front to back. only 22.75 from ground to top. I believe the front to back is
what I should use, so
3000X23.25/1059=66 mph cool! <dam I never go that slow. I'm usually turning
3700 or 81 mph
Victor,
I will give you several ways of calculating your speedometers accuracy.
Item 1: Speedometer check. For this one you will need one of the
Cal Trans Speed check zones. MPH=3600/time in seconds between
points in a mile. 3600 is seconds in an hour. Take a stop watch or your
wrist watch and time your car between points at a given mile an hour
lets say
60. If it takes you 60 seconds you are doing 60 miles an hour.
Item 2: Wheel and gear calc. MPH= rpm x tire diameter/gear ratio x 336.
So lets use these numbers since I do not no the diameter of your
specific
tire, but I do know your rearend gear ratio and the gear ratio of fifth
gear.
Lets assume your tire diameter is 26", and your rpm in fifth gear is
4000.
MPH= 4000 x 26 / 3.70 x .852 x 336
MPH= 104000 / 1059
MPH=98
Fifth gear ratio of a 2 liter five speed is: .852
Rear end gear ratio of a 2 liter is :3.7
336 is the constant
My tire diameter is only 22.7" with 185/60/14 tires.
You can do this calculation in any gear by substituting the trans gear
ratio
and rpm numbers.
Here are the gear ratio's.
1st: 2.957
2 nd: 1.858
3 rd : 1.311
4 th: 1.00
5 th: .852
I hope this doesn't totally confuse you.
Mike
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